The Australian dollar has slumped to another six-year low after the greenback rallied on US economic data. At 7am on Friday, the currency was trading at 72.91 US cents, down from 73.01 cents on Thursday.

SYDNEY—The Australian dollar's fall to near its post-float average is beginning to lift the country's economy, according to John Edwards, a member of the Reserve Bank of Australia's rate-setting board.